ARRANGEMENT WITH ADJUSTABLE SUPPORT STRUCTURE

Description

Technical field of the invention

[0001] The invention relates to an assembly and a rubber article, in particular a pneumatic tire, comprising this assembly.

[0002] The invention relates in particular to the field of pneumatic tires intended for use on vehicles. The pneumatic tire is preferably designed for passenger vehicles, but can be used on any other type of vehicle such as two-wheeled vehicles, heavy goods vehicles, agricultural vehicles, construction equipment or aircraft or, more generally, on any rolling device. Previous art

[0003] In what follows, and by convention, the circumferential direction XX', axial direction YY', and radial direction ZZ' respectively denote a direction tangent to the tread surface of the tire in the direction of tire rotation, a direction parallel to the tire's axis of rotation, and a direction perpendicular to the tire's axis of rotation. "Radially inside" and "radially outside" respectively mean "closer to the tire's axis of rotation" and "further from the tire's axis of rotation," respectively.By "axially inside", respectively "axially outside", we mean "closer to the equatorial plane of the tire", respectively "further from the equatorial plane of the tire", the equatorial plane XZ of the tire being the plane passing through the middle of the rolling surface of the tire and perpendicular to the axis of rotation of the tire.

[0004] Generally, a tire consists of a crown with two axial ends, each extended radially inward by a sidewall and then by a bead designed to contact a rim, the whole assembly defining an internal toroidal cavity. More precisely, the crown comprises, radially from the outside in, a tread, designed to contact the ground via a rolling surface, a crown reinforcement, and a portion of the carcass reinforcement intended to strengthen the tire. The carcass reinforcement connects the two sidewalls by extending into a radially inward portion of the crown and is anchored, in each bead, to a circumferential reinforcing element, most often a bead.

[0005] A pneumatic tire has, at every point of its contact surface with the ground, a double curvature: a circumferential curvature and a meridional curvature. Circumferential curvature refers to a curvature in a circumferential plane, defined by the circumferential and radial directions. Meridional curvature refers to a curvature in a meridional or radial plane, defined by the axial and radial directions.

[0006] It is known that the flattening of a tire on a horizontal surface, in a circumferential plane and in a meridional plane, is determined by the values ​​of the circumferential and meridional radii of curvature, respectively, at points on the tread surface located at the limits of the tire's contact patch with the ground. This flattening is facilitated by larger radii of curvature, meaning smaller curvatures, since the curvature at a point, mathematically speaking, is the inverse of the radius of curvature. It is also known that the flattening of the tire impacts tire performance, particularly rolling resistance, grip, wear, and noise.

[0007] Therefore, the expert, a specialist in pneumatic tires, seeking to obtain the right compromise between the expected performance of pneumatic tires such as, but not limited to, wear, grip, endurance, rolling resistance and noise, has developed alternative solutions to the classic pneumatic tire to optimize its flattening.

[0008] A conventional, state-of-the-art pneumatic tire typically exhibits a large meridional curvature, meaning a small meridional radius of curvature, at the axial ends of the tread, known as the shoulders, when the tire, mounted on its rim and inflated to its recommended operating pressure, is subjected to its nominal load. The mounting rim, operating pressure, and nominal load are defined by standards, such as, for example, the standards of the European Tyre and Rim Technical Organisation (ETRTO).

[0009] Pneumatic bandages allowing for improved flattening have been proposed. For example, documents WO2018 / 130782 and WO2018 / 130783 describe a pneumatic bandage with facilitated flattening, comprising a first and a second fabric extending in a first general direction, connected by a support structure comprising load-bearing wire elements connecting the first fabric to the second fabric, each load-bearing wire element comprising at least one load-bearing wire portion extending between the first and the second fabric, the first fabric being able to elongate in the first general direction during the shaping of the pneumatic bandage.

[0010] Document WO2017 / 103491 discloses the preamble of claim 1 and presents a pneumatic tire of similar structure in which the wire elements of the first and second structures have been pre-glued before their incorporation into the assembly in order to avoid their variation in length during heat treatments which could alter the geometry of the assembly, and therefore its expected operation in the pneumatic tire.

[0011] It is therefore clear that maintaining the geometry of the assembly is crucial throughout the various manufacturing stages of a tire, or a rubber product incorporating such an assembly. In particular, the load-bearing wire sections of each wire element must be tensioned uniformly between the first and second layers to effectively absorb at least a portion of the load applied to a tire when fitted to a vehicle. However, slight variations in the assembly's positioning can occur during the manufacturing of the rubber product or tire, leading to small variations in the length of the wire elements. These variations could result in differences in tension between the wire elements, or even leave some wire elements partially tensioned between the two layers of the assembly while others remain fully taut.

[0012] The present invention aims to provide an assembly that solves these problems, in particular with load-bearing wire elements whose properties allow them to be tensioned homogeneously after the manufacture of a rubber article or pneumatic bandage incorporating the assembly, thus allowing both simpler manufacturing and obtaining the expected operation of said article or bandage. Detailed description of the invention

[0013] The invention relates to the subject matter of claim 1. The disclosure further relates to one of the following embodiments: 1. An assembly comprising: a. a first fabric, having a longitudinal edge extending in a first direction (G1); b. a second fabric, comprising a longitudinal edge extending in a second direction (G2), the first direction (G1) and the second direction (G2) being substantially parallel; c. a supporting structure comprising load-bearing wire elements made of heat-shrinkable textile material connecting the first fabric to the second fabric, each load-bearing wire element comprising at least one load-bearing wire portion extending between the first and second fabrics; characterized in that the load-bearing wire elements have a thermal contraction CT, measured after 2 min at 185°C, greater than or equal to 5%. 2. An assembly according to the preceding embodiment in which each load-bearing wire element has a thermal contraction CT, measured after 2 min at 185°C, strictly greater than 5%, preferably greater than or equal to 6%.preferably greater than or equal to 8%. 3. Assembly according to any of the preceding embodiments in which the load-bearing yarn elements are made of a polyamide material, preferably selected from aliphatic polyamides, preferably from polyamides 4-6, 6, 6-6, 11, 12, and most preferably Nylon 6-6. 4. Assembly according to any of the preceding embodiments in which the load-bearing yarn elements comprise at least one multifilament strand comprising several monofilaments. 5. Assembly according to any of embodiments 1 to 3 in which the load-bearing yarn elements consist of a single monofilament. 6. Assembly according to any of the preceding embodiments in which each load-bearing yarn element has a count in the range of 8 Tex to 210 Tex, preferably from 23 Tex to 140 Tex,and more preferably from 45 Tex to 70 Tex. 7. Assembly according to any one of the preceding embodiments in which each load-bearing wire element is coated with an adhesive composition. 8. Assembly according to the preceding embodiment in which the adhesive composition is a Resorcinol-Formaldehyde-Latex adhesive known as RFL, or an adhesive composition based on a phenol-aldehyde resin and a latex. 9. Assembly according to any one of embodiments 7 or 8 in which the adhesive composition is cross-linked. 10. Assembly according to any one of the preceding embodiments in which, prior to its incorporation into the assembly, each load-bearing wire element of the supporting structure is subjected to an adhesion treatment comprising at least: a. an adhesion step of bringing the load-bearing wire element into contact with an adhesive composition, and b. a heat treatment step, known as the adhesion drying step, at a temperature ranging from 100 to 230°C.preferably from 160 to 230°C for a duration of 30 to 300 s, the supporting wire element being maintained under a tension of between 0.2 and 4.0 daN, preferably between 0.2 and 3 daN, and more preferably between 0.2 and 1 daN during the bonding treatment. 11. Assembly according to the preceding embodiment in which the bonding treatment includes, prior to the bonding step, a step, called the tack step, of bringing the supporting wire element into contact with a primary adhesion composition. 12. Assembly according to the preceding embodiment in which the bonding treatment includes, between the tack step and the bonding step, a heat treatment step, called the tack drying step, at a temperature of 100 to 230°C, preferably from 160 to 230°C.for a duration ranging from 30 to 300 s. 13. Assembly according to any of the preceding realizations in which the first fabric comprises first thread elements, called warp elements, substantially parallel to each other and extending along a first direction (C1) called warp direction, substantially parallel to the first general direction (G1), and in which, for any elongation of the first fabric along the first general direction (G1) less than or equal to 2×π×H / L, there exist unbroken first thread warp elements, with 0 < H ≤ K×H0, H0 representing in m the average straight distance between an inner face of the first fabric and an inner face of the second fabric when each load-bearing thread portion is at rest, L representing the rest length of the first fabric along the first general direction (G1) and K=1,3. 14. Assembly according to any of the preceding embodiments in which the maximum force developed by the first fabric is greater than or equal to (P0×(L / 2π+H)×1) / 2, where 1 is the width of the first fabric measured perpendicular to the first general direction and expressed in meters, and P0 is equal to 100,000 Pa. 15. Impregnated assembly comprising an assembly according to any of the preceding embodiments, the first fabric being impregnated at least partially with a composition referred to as the first polymeric composition, and the second fabric being impregnated at least partially with a composition referred to as the second polymeric composition. 16. Rubber article comprising an assembly according to any of embodiments 1 to 14, or an impregnated assembly according to embodiment 15. 17. Tire comprising an assembly according to any of embodiments 1 to 14.or an impregnated assembly according to embodiment 15. 18. A tire according to the preceding embodiment comprising a crown having two axial ends, each extended radially inwards by a sidewall and then by a bead intended to contact a rim, the assembly consisting of the crown, the two sidewalls and the two beadings defining an internal toroidal cavity and at least one bead, the tire comprising an assembly according to any one of the arrangements of the invention, intended to at least partially support the nominal load Z applied to the tire mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially internal part of the crown and the second fabric at least partially defining the radially internal part of the toroidal cavity, the load-bearing structure extending continuously into the internal toroidal cavity, such that, when the tire is subjected to a nominal load Z,The load-bearing wire elements, connected to a portion of the tire in contact with the ground, are subjected to buckling in compression, and at least a portion of the load-bearing wire elements, connected to the portion of the tire not in contact with the ground, are in tension. 19. Tire according to the preceding embodiment in which the toroidal cavity is completely delimited in its radially internal part by at least one second fabric of an assembly according to any one of embodiments 1 to 14. 20. Tire according to embodiment 18 in which the toroidal cavity is partially delimited in its radially internal part by at least one second fabric of an assembly according to any one of embodiments 1 to 14. 21. Tire according to the preceding embodiment comprising: a. a vertex having two axial ends, each extended radially inwards by a sidewall and then by a bead intended to contact a rim, the assembly formed by the vertex,the two sidewalls and the two beadings defining an internal toroidal cavity, b. at least one bead being extended axially inwards by a cantilevered flexible tread comprising a free end, c. the flexible tread comprising a portion anchored to the bead and a rigid running portion, extending axially inwards from the anchoring portion to the free end, the tire comprising an assembly according to one of embodiments 1 to 14 or an impregnated assembly according to embodiment 15, intended to bear at least part of the nominal load Z applied to the tire mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially inner part of the crown and the second fabric being fixed to the flexible tread, the load-bearing structure extending continuously into the internal toroidal cavity, such that, when the tire is subjected to a nominal load Z,The load-bearing wire elements, connected to a portion of the tire in contact with the ground, are subjected to buckling in compression, and at least some of the load-bearing wire elements, connected to the portion of the tire not in contact with the ground, are in tension. Definitions

[0014] The carbon-containing compounds mentioned in the description can be of fossil origin or bio-based. In the latter case, they may be partially or entirely derived from biomass or obtained from renewable raw materials derived from biomass. This includes, in particular, polymers, plasticizers, fillers, etc.

[0015] By "substantially parallel" or "extending substantially along", we mean that the angle formed by the two directions in question is less than 10°, preferably less than 5°, preferably less than 2° and most preferably less than or equal to the measurement error of the angle by a suitable method.

[0016] The "general direction" of an object refers to the general direction in which the object extends along its greatest length. For a fabric, the general direction is parallel to its longitudinal edges. Thus, for example, a fabric wound on a spool of revolution around an axis has a general direction that is substantially parallel to the direction of unwinding (that is, the circumferential direction), which is perpendicular to the axial and radial directions of the spool.

[0017] Any range of values ​​designated by the expression "between a and b" represents the range of values ​​from more than a to less than b (i.e., excluding bounds a and b) while any range of values ​​designated by the expression "from a to b" means the range of values ​​from the bound "a" to the bound "b", i.e., including the strict bounds "a" and "b".

[0018] The expression "element based on" means an element comprising the mixture and / or the in situ reaction product of the different constituents or materials used, some of these constituents or materials being able to react and / or intended to react with each other, at least partially, during the different phases of manufacturing the element.

[0019] In this document, a wire element is defined as any long, elongated element of considerable length relative to its cross-section, regardless of the shape of the latter, for example, circular, oblong, rectangular, square, or even flat. This wire element may, for example, be twisted or corrugated. When its cross-section is circular, the diameter of this section is preferably less than 5 mm, and more preferably within a range of 100 µm to 1.2 mm. Assembly

[0020] The principle of the assembly according to the invention is to have a load-bearing structure comprising load-bearing elements connecting the first fabric and the second fabric, and capable, once the assembly is arranged in the rubber article or pneumatic tire, of carrying at least part of the load applied to said article or tire by tensioning a part of the load-bearing elements positioned outside the contact area, the load-bearing elements positioned in the contact area being subjected to buckling because they undergo a compressive force and therefore do not participate in carrying the applied load.

[0021] During the crosslinking stages of the rubber article, and in particular the pneumatic tire, in which the assembly according to the invention is integrated, the load-bearing wire elements, whose thermal contraction exceeds 5%, contract to absorb any excess length that may arise from the geometric characteristics of the load-bearing wire elements or from misalignments in the positioning of the assembly according to the invention during the manufacturing of the rubber article or the pneumatic tire according to the invention. Thus, at the end of the crosslinking stages, the load-bearing wire elements are uniformly tensioned, each able to contribute to absorbing at least part of the applied load, and enabling the expected operation of said article or tire. First fabric of the assembly according to the invention

[0022] The first fabric of the assembly according to the invention has a longitudinal edge extending along a first general direction (G1).

[0023] In a preferred embodiment, the first fabric is arranged so that, for any non-zero stress, expressed in N, less than or equal to (P0 x (L / 2π + H) x1) / 2 exerted on the first fabric along the first general direction, the first fabric exhibits a non-zero elongation along the first general direction.

[0024] In this expression and in the rest of the exposition, 1 is the width of the first fabric expressed in meters and P0=100000 Pa, with 0 < H ≤ K×H0, H0 representing in meters the average straight distance between an inner face of the first fabric and an inner face of the second fabric when each load-bearing wire portion is at rest, L representing the rest length of the first fabric along the first general direction (G1) and K=1,2.

[0025] In a preferred embodiment, the first fabric is arranged so that, for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L, the first fabric develops a force, expressed in N, along the first general direction less than or equal to (P0 x (L / 2π + H) x1) / 2. The force developed is measured by applying the standard NF EN ISO 13934-1 of July 2013.

[0026] Thus, the first fabric is deformable under a relatively low stress which allows, during the tire manufacturing process, the use of an appropriate conforming stress that does not risk damaging the blank.

[0027] In one embodiment, the maximum force of the first fabric along the first general direction is greater than (P0 x (L / 2π + H) x 1) / 2. The maximum force is the force required to obtain the elongation at maximum force as defined in the NF EN ISO 13934-1 standard of July 2013. Thus, under imposed stress, the first fabric is not to break during shaping.

[0028] Advantageously, P0 = 80,000 Pa, preferably P0 = 60,000 Pa, and more preferably P0 = 40,000 Pa. The smaller P0 is, the more it is possible to use small stresses during the tire manufacturing process and the less risk there is of damaging the blank during this process.

[0029] Preferably, the first fabric comprises first yarn elements, called warp elements, substantially parallel to each other and extending along a first direction (C1), called the warp direction, substantially parallel to the first direction (G1). Preferably, for any elongation of the first fabric along the first general direction (G1) less than or equal to 2πH / L, the first yarn elements are unbroken. Each first yarn element can, for example, be an expandable yarn element as described in applications WO2018 / 130782 and WO2018 / 130783.

[0030] Since the first warp direction is substantially parallel to the first general direction, and the first fabric is sufficiently deformable, the manufacturing process for a pneumatic tire, including the assembly according to the invention, is greatly simplified. Indeed, the first fabric can be deformed by stretching the first yarn element without breaking, thus elongating sufficiently to conform to the shape imposed upon it during the manufacturing of the pneumatic tire.

[0031] Preferably, the first fabric comprises first weft elements, substantially parallel to each other and interlaced with the first warp elements. In this preferred embodiment, the first fabric comprises, as is known to those skilled in the art, a weave characterizing the interlacing of the first warp and weft elements. Depending on the embodiment, this weave is plain weave, twill, or satin. Preferably, to provide good mechanical properties for use in a pneumatic tire, the weave is plain weave.

[0032] Preferably, the first warp and weft directions form an angle with each other ranging from 70° to 90°, preferably substantially equal to 90°.

[0033] The mechanical characteristics of such fabrics, such as their tensile stiffness and maximum tensile strength, depending on the direction of the warp or weft yarns, are determined by the characteristics of the yarns themselves. For textile yarns, these characteristics include the thread count, expressed in tex or g / 1000 m, the tenacity, expressed in cN / tex, and the standard shrinkage, expressed as a percentage. These yarns are distributed according to a given density, expressed in thread count per decimeter. All these characteristics are a function of the material from which the yarns are made and their manufacturing process.

[0034] In one embodiment, each supporting wire element includes a first wire portion anchoring each supporting wire element in the first fabric extending the supporting wire portion in the first fabric.

[0035] Preferably, each first anchoring wire section is interwoven with the first fabric. Such an assembly has the advantage of being able to be manufactured in a single step. However, it is also possible to manufacture the assembly in two steps: a first step for manufacturing the first fabric and a second step for interweaving the load-bearing wire element(s) with the first fabric. In both cases, the interweaving of each load-bearing element with the first fabric ensures the mechanical anchoring of each load-bearing wire element within the first fabric, thus imparting the desired mechanical properties to the load-bearing structure.

[0036] In one embodiment, in order to ensure the mechanical anchoring of the anchor wire portion, each first anchor wire portion is wound at least partially around at least one first wire element of the first fabric.

[0037] Preferably, the first fabric comprises: of the first wire elements, called warp elements, substantially parallel to each other and extending along a first direction, called the warp direction, substantially parallel to the first general direction, and of the first wire elements, called weft elements, substantially parallel to each other and extending along a first direction, called the weft direction, and intersecting with the first wire warp elements, each first anchor wire portion being wound at least in part around at least one first weft wire element of the first fabric, preferably around at least two first adjacent weft wire elements along the first general direction.

[0038] In one embodiment, each first anchor wire portion extends in a direction substantially parallel to the first general direction.

[0039] Preferably, each first anchor wire portion passes alternately from one face of the first fabric to the other face of the first fabric between two adjacent first weft wire elements around which the first anchor wire portion is wound.

[0040] Preferably, the first warp threads extend continuously along the entire length of the first fabric. Second fabric of the assembly

[0041] In one embodiment, the second fabric comprises: second wire elements, called warp, substantially parallel to each other and extending along a second direction (C2), called warp, and second wire elements, called weft, substantially parallel to each other and extending along a second direction, called weft and intersecting with the second wire elements of warp.

[0042] In this preferred embodiment, the second fabric comprises, as is known to those skilled in the art, a weave characterizing the interlacing of the second warp and weft threads. Depending on the embodiment, this weave is plain weave, twill, or satin. Preferably, to provide good mechanical properties for use in pneumatic tires, the weave is plain weave.

[0043] Preferably, the second warp and weft directions form an angle with each other ranging from 70° to 90°, preferably substantially equal to 90°.

[0044] Preferably, the second fabric extends along a second general direction (G2), the second warp direction (C2) of the second yarn elements being substantially parallel to the second general direction (G2). Such a second fabric allows for a greatly simplified manufacturing process for the assembly and the pneumatic bandage.

[0045] In another embodiment, the second fabric is a knit comprising interlaced loops.

[0046] In one embodiment, each supporting wire element includes a second wire portion anchoring each supporting wire element in the second fabric extending the supporting wire portion in the second fabric.

[0047] Preferably, each second anchoring wire section is interlaced with the second fabric. Such an assembly has the advantage of being able to be manufactured in a single step. However, it is also possible to manufacture the assembly in two steps: a first step of manufacturing the second fabric and a second step of interlacing the load-bearing wire element(s) with the second fabric. In both cases, the interlacing of each load-bearing element with the second fabric ensures the mechanical anchoring of each load-bearing element within the second fabric, thus imparting the desired mechanical properties to the load-bearing structure.

[0048] In one embodiment, in order to ensure the mechanical anchoring of the anchor wire portion, each second anchor wire portion is wrapped at least partially around at least one second wire element of the second fabric.

[0049] Preferably, the second fabric comprises: second wire elements, called warp elements, substantially parallel to each other and extending in a second direction, called the warp direction, and second wire elements, called weft elements, substantially parallel to each other and extending in a second direction, called the weft direction, and interlacing with the second warp wire elements, each second anchor wire portion being wound at least in part around at least one second weft wire element of the second fabric, preferably around at least two adjacent second weft wire elements along the second general direction.

[0050] In one embodiment, each second anchor wire portion extends in a direction substantially parallel to the second general direction.

[0051] Preferably, each second anchor wire portion passes alternately from one face of the second fabric to the other face of the second fabric between two adjacent second weft wire elements around which the second anchor wire portion is wound.

[0052] Preferably, the second warp thread elements extend continuously along the entire length of the second fabric. Load-bearing structure

[0053] The assembly according to the invention comprises a load-bearing structure including load-bearing wire elements made of heat-shrinkable textile material connecting the first fabric to the second fabric. Each load-bearing wire element includes at least one load-bearing wire portion extending between the first and second fabrics. Each load-bearing wire element has a thermal contraction (TC), measured after 2 minutes at 185°C, greater than or equal to 5%, preferably strictly greater than 5%, preferably greater than or equal to 6%, and preferably greater than or equal to 8%. Each load-bearing wire element is preferably coated with an adhesive composition, preferably cross-linked.

[0054] To measure the thermal contraction of the load-bearing wire elements, a 250 mm test specimen is placed under very low tension using a 4.5 g mass at room temperature (25°C). Its length L0 is measured before exposure to temperature. The length of the specimen L1 is measured after exposure to a temperature of 185°C for 2 min. The thermal contraction CT is calculated according to: CT = (L0 - < L1) / L0 x 100.

[0055] Preferably, each load-bearing wire element is coated with an adhesive composition, preferably cross-linked, by an adhesion treatment comprising at least: a) a step, called adhesion, of bringing the carrier wire element into contact with an adhesive composition, and b) a heat treatment step, called adhesion drying, at a temperature ranging from 100 to 230°C, preferably from 160 to 230°C for a duration ranging from 30 to 300 s, the supporting wire element being maintained under a tension between 0.2 and 4.0 daN, preferably between 0.2 and 3 daN, and more preferably between 0.2 and 1 daN during the adhesion treatment.

[0056] The conditions of the heat treatment associated with the nature and maintenance under tension of the wire carrier element during the adhesion treatment make it possible to preserve a high thermal contraction of the coated carrier element, which allows a simplified implementation of the assembly according to the invention.

[0057] The adhesive composition used may be an RFL (resorcinol-formaldehyde-latex) adhesive. These RFL adhesives, as is well known, comprise a thermosetting phenolic resin, obtained by the condensation of resorcinol with formaldehyde, and one or more diene rubber latexes in aqueous solution. It should be noted that a latex is a stable dispersion of elastomer microparticles suspended in an aqueous solution.

[0058] The diene elastomer of latex is preferably a diene elastomer selected from the group consisting of polybutadienes, butadiene copolymers, polyisoprenes, isoprene copolymers, and mixtures of these elastomers. It is even more preferably selected from the group consisting of butadiene copolymers, vinylpyridine-styrene-butadiene terpolymers, natural rubber, and mixtures of these elastomers.

[0059] The adhesive composition may also be one of the phenol-aldehyde resin-based glues described in applications WO 2013 / 017421, WO 2013 / 017422, WO 2013 / 017423, WO2015007641 and WO2015007642.

[0060] Preferably, the bonding process includes, prior to the bonding step, a priming step in which the carrier fiber element is contacted with a primer. The carrier fiber element is thus coated with a layer of primer, which is itself coated with a layer of adhesive. An example of a primer is an epoxy resin and / or an isocyanate compound, possibly with a blocking agent. The priming step is preferably followed by a heat treatment step, known as the bond drying step, at a temperature ranging from 100 to 230°C, preferably from 160 to 230°C, for a duration ranging from 30 to 300 seconds.

[0061] Preferably, the load-bearing wire elements exhibit, prior to the adhesion treatment, a thermal contraction CT, measured after 2 min at 185°C, greater than 5%.

[0062] Each supporting wire element is made of heat-shrinkable textile material. By textile, we mean that each supporting wire element is non-metallic, for example made of a material chosen from polyester, polyamide, polyketone, cellulose, natural fiber or a mixture of these materials.

[0063] Examples of polyesters include PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PBT (polybutylene terephthalate), PBN (polybutylene naphthalate), PPT (polypropylene terephthalate), and PPN (polypropylene naphthalate). Examples of polyamides include aliphatic polyamides such as polyamides 4-6, 6, 6-6 (nylon), 11, and 12.

[0064] Preferably, the load-bearing wire element is made of a polyamide material, most preferably nylon. Nylon load-bearing wire elements exhibit thermal contraction particularly well-suited for use in the assembly according to the invention.

[0065] Each supporting yarn element is a textile assembly comprising one or more monofilament or multifilament textile fibers, twisted together or not. Thus, in one embodiment, the assembly may have fibers that are substantially parallel to each other. In another embodiment, the assembly may have fibers that are twisted helix. In yet another embodiment, each supporting yarn element consists of a monofilament. Each monofilament or multifilament fiber has a diameter between 5 and 20 µm, for example, 10 µm.

[0066] Each supporting filament element, in particular each filament portion that connects the inner surfaces of the first and second tissues, can be geometrically characterized by its resting length LP and its mean cross-sectional area SP, which is the average of the cross-sections obtained by cutting the filament portion through all surfaces parallel to the first and second tissues and located between them. In the most frequent case of a constant cross-sectional area for both the supporting filament element and the filament portion, the mean cross-sectional area SP is equal to this constant cross-sectional area.

[0067] Each load-bearing wire element, in particular each load-bearing portion, typically has a smallest characteristic dimension E of its average cross-section SP, preferably at most equal to 0.02 times the maximum spacing between the two inner faces of the first and second tissues (which corresponds to the average radial height H of the inner annular space once the assembly is arranged within a pneumatic bandage in the absence of load applied to the pneumatic bandage and in the absence of pressure in the pneumatic bandage) and an aspect ratio R of its average cross-section SP preferably at most equal to 3. A smallest characteristic dimension E of the average cross-section SP of the load-bearing element at most equal to 0.02 times the average radial height H of the inner annular space excludes any massive load-bearing element, having a significant volume.In other words, when the structure is wire-like, each load-bearing element has a high slenderness ratio along the radial direction, allowing it to buckle as it passes through the contact area. Outside the contact area, each wire-like load-bearing element returns to its initial geometry because its buckling is reversible. Such a wire-like load-bearing element exhibits good fatigue resistance.

[0068] A form ratio R of its mean section SP of at most 3 means that the largest characteristic dimension V of its mean section SP is at most 3 times the smallest characteristic dimension E of its mean section SP. As examples, a circular mean section SP, having a diameter equal to d, has a form ratio R=1, a rectangular mean section SP, having a length V and a width V', has a form ratio R=V / V', and an elliptical mean section SP, having a major axis B and a minor axis B', has a form ratio R=B / B'.

[0069] A wire-bearing element has a wire-type mechanical behavior, that is to say, it can only be subjected to tensile or compressive forces along its average line.

[0070] The load-bearing filaments are arranged so that they are paired and mechanically unlinked within a space delimited by the first and second tissues. Thus, the load-bearing elements exhibit independent mechanical behavior. For example, the load-bearing elements are not linked together to form a network or lattice.

[0071] In a preferred embodiment, the load-bearing structure comprises a plurality of identical load-bearing wire elements, i.e., whose geometric characteristics and constituent materials are identical.

[0072] In one embodiment, each supporting wire element extends alternately from the first fabric to the second fabric and from the second fabric to the first fabric when moving along the supporting wire element. Areas of the tissue

[0073] In a preferred embodiment that efficiently ensures the conformation of the first fabric of the assembly according to the invention, the first fabric comprises: a first group of zones comprising at least one straight transverse zone (Z1), each straight transverse zone (Z1) of the first group of zones being arranged so as to permit an elongation of at least one straight transverse zone (Z1) of the first group of zones along the first general direction (G1), preferably an elongation of each straight transverse zone (Z1) of the first group of zones along the first general direction (G1), a second group of zones comprising at least one straight transverse zone (Z2), each straight transverse zone (Z2) of the second group of zones being arranged so as to prevent a break of said straight transverse zone (Z2).

[0074] By definition, a straight transverse zone of the fabric is bounded longitudinally by two imaginary lines approximately perpendicular to the first general direction of the fabric. A straight transverse zone extends across the entire width of the fabric; that is, the straight transverse zone is bounded transversely by the longitudinal edges of the fabric.

[0075] Preferably, each transverse straight zone of the first group of zones is arranged so as to allow an elongation of each transverse straight zone of the first group of zones along the first general direction for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first tissue along the first general direction, and for any elongation of the first tissue along the first general direction less than or equal to 2×π×H / L.

[0076] Preferably, each straight transverse zone of the second group of zones is arranged so as to prevent a rupture of each straight transverse zone of the second group of zones for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first tissue along the first general direction, and for any elongation of the first tissue along the first general direction less than or equal to 2×π×H / L.

[0077] In an embodiment enabling the obtaining of straight transverse zones of the second group of undeformable zones, each straight transverse zone of the second group of zones is arranged so as to prevent an elongation of each straight transverse zone of the second group of zones along the first general direction, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to 2×π×H / L.

[0078] In another embodiment allowing for obtaining straight transverse zones of the second group of deformable zones, each straight transverse zone of the second group of zones is arranged so as to allow an elongation of each straight transverse zone of the second group of zones along the first general direction, this elongation being preferably at most equal to 20%, preferably to 15%, and more preferably to 10% of the elongation of each straight transverse zone of the first group of zones along the first general direction, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0079] Preferably, each straight transverse zone of the first group of zones is arranged so as to permit an elongation of each first warp wire element along the first general direction in each straight transverse zone of the first group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0080] The lengthening of each first wire element of the chain can be achieved by any means, for example by first wire elements as described in applications WO2018 / 130782 and WO2018 / 130783.

[0081] Preferably, each straight transverse zone (Z1) of the first group of zones is arranged so as to permit a spacing of the weft wire elements from one another along the first general direction in each straight transverse zone of the first group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0082] In a preferred embodiment, each transverse straight zone (Z2) of the second group of straight zones is arranged so as to prevent a break in each first warp wire element in each transverse straight zone (Z2) of the second group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0083] In an embodiment enabling the obtaining of transverse straight zones (Z2) of the second group of undeformable zones, each transverse straight zone (Z2) of the second group of zones is arranged so as to prevent an elongation of each first warp wire element along the first general direction in each transverse straight zone (Z2) of the second group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0084] In another embodiment allowing for obtaining transverse straight zones (Z2) of the second group of deformable zones, each transverse straight zone (Z2) of the second group of zones is arranged so as to allow an elongation of each first warp wire element along the first general direction in each transverse straight zone (Z2) of the second group of zones, this elongation being preferably at most equal to 20%, preferably to 15%, and more preferably to 10% of the elongation of each first warp wire element along the first general direction in each transverse straight zone (Z2) of the first group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0085] Optionally, in the embodiment using transverse straight zones (Z2) of the second group of rigid zones, each transverse straight zone (Z2) of the second group of zones is arranged so as to prevent a separation of the first weft yarn elements from each other along the first general direction in each transverse straight zone (Z2) of the second group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0086] Optionally, in the embodiment using transverse straight zones (Z2) of the second group of deformable zones, each transverse straight zone (Z2) of the second group of zones is arranged so as to permit a spacing of the first weft wire elements from one another along the first general direction in each transverse straight zone (Z2) of the second group of zones, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0087] In the preferred embodiments described above, each straight transverse zone (Z1) of the first group of zones is a so-called deformable zone. Such zones are deformable under conforming conditions and contribute to the conformability of the first tissue. Each straight transverse zone (Z2) of the second group of zones is a so-called unbreakable zone. Optionally, in one embodiment, each straight transverse zone (Z2) of the second group of zones is undeformable. In another embodiment, each straight transverse zone (Z2) of the second group of zones is deformable but to a much lesser extent than each straight transverse zone (Z1) of the first group of zones. Such zones are unbreakable under conforming conditions and contribute little or nothing to the conformability of the first tissue.Thus, each deformable transverse straight zone (Z1) in the first group of zones deforms sufficiently to allow the assembly to form and compensates for the lack of elongation or the slight elongation of the unbreakable transverse straight zones (Z2) in the second group of zones. The elongation at maximum force of all the transverse straight zones in the first group of zones will be greater the shorter and fewer the deformable transverse straight zones in the first group of zones are compared to the unbreakable transverse straight zones in the second group of zones.At the scale of the wire elements of the chain, the portions of each first wire element of the chain located in each straight transverse zone (Z1) called deformable of the first group of zones deform sufficiently to allow the conformation of the assembly and compensate for the non-elongation or the low elongation of the portions of each first wire element of the chain located in the straight transverse zones (Z2) unbreakable of the second group of zones.

[0088] Also, each so-called deformable zone of the first group of zones is deformable under a relatively low stress which allows, during the tire manufacturing process, the use of an appropriate conforming stress which does not risk damaging the blank.

[0089] In a preferred embodiment, all transverse straight zones (Z1) of the first group of zones are identical, and the elongation at maximum force Art1 of each transverse straight zone (Z1) of the first group of zones along the first general direction satisfies Art1 > (2π x H) / SLd1, where SLd1 is the sum of the rest lengths Ld1 of all the transverse straight zones (Z1) of the first group of zones. The elongation at maximum force is measured in accordance with standard NF EN ISO 13934-1 of July 2013 on samples of transverse straight zones (Z1) from the first group of zones.

[0090] Advantageously, in the preceding embodiment, the elongation at break Arc of each first wire element of the chain satisfies Arc > (2π x H) / SLd1. The elongation at break Arc is measured according to ASTM D885 / D885 MA of January 2010. The elongation at break Arc of each wire element is the elongation required to cause the first and second wire elements to break.

[0091] Preferably, for any elongation of each straight transverse zone (Z1) of the first group of zones along the first general direction less than or equal to (2π x H) / SLd1, the first fabric develops a force, expressed in N, along the first general direction less than or equal to (P0 x (L / 2π + H) x1) / 2, SLd1 being the sum of the rest lengths of all the straight transverse zones (Z1) of the first group of zones expressed in m. The elongation, the stress exerted and the force developed are determined in accordance with standard NF EN ISO 13934-1 of July 2013.

[0092] In a preferred embodiment, each supporting wire element includes a first wire portion anchoring each supporting wire element in the first fabric extending the supporting wire portion in the first fabric: each straight transverse zone (Z1) of the first group of zones being devoid of any first wire anchor portion, each straight transverse zone (Z2) of the second group of zones comprising at least one first wire anchor portion.

[0093] Preferably, each straight transverse zone (Z2) of the second group of zones is arranged so as to prevent a break in each first wire portion of anchorage, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first tissue along the first general direction, and for any elongation of the first tissue along the first general direction less than or equal to (2π x H) / L.

[0094] Thus, each straight transverse zone (Z2) comprising at least one first wire anchoring portion is unbreakable even under relatively high stress, which allows, during the tire manufacturing process, the use of an appropriate conforming stress that does not risk damaging the blank.

[0095] In one embodiment, each straight transverse zone (Z2) of the second group of zones is arranged so as to prevent elongation of each first wire anchor portion along the first general direction, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0096] In another embodiment, each straight transverse zone (Z2) of the second group of zones is arranged so as to permit an elongation of each first wire portion of anchorage along the first general direction, in particular and preferably for any non-zero stress less than or equal to (P0×(L / 2π+H)×1) / 2 exerted on the first fabric along the first general direction, and for any elongation of the first fabric along the first general direction less than or equal to (2π x H) / L.

[0097] Advantageously, P0 = 80,000 Pa, preferably P0 = 60,000 Pa, and more preferably P0 = 40,000 Pa. The smaller P0 is, the more it is possible to use small stresses during the tire manufacturing process and the less risk there is of damaging the blank during this process.

[0098] Preferably, each straight transverse zone (Z1) of the first group of zones alternates, according to the first general direction, with a straight transverse zone (Z2) of the second group of zones.

[0099] Thus, at the scale of the first tissue, a homogeneous deformation of the entire tissue is obtained, this deformation being all the more homogeneous the smaller the rest length of each transverse straight zone along the first general direction. By rest length of a transverse straight zone along the first general direction, we mean the length of the zone along the longitudinal direction in the absence of any external stress exerted on the zone (other than atmospheric pressure). A transverse straight zone at rest along the first general direction is neither in extension nor compression along this direction and therefore exhibits zero elongation in this direction.

[0100] The assembly according to the invention can be bonded, that is, coated at least partially with at least one aqueous adhesive composition promoting adhesion between the first filament elements of the first fabric and / or the second filament elements of the second fabric with an elastomeric composition. In a two-layer embodiment, each first and second filament element to be bonded is coated with a layer of an adhesion primer, itself coated with a layer of adhesive composition. In a one-layer embodiment, each first and second filament element to be bonded is directly coated with a layer of adhesive composition. An example of an adhesion primer is an epoxy resin and / or an isocyanate compound, optionally blocked.The adhesive composition used may be a conventional RFL (Resorcinol-formaldehyde-latex) adhesive or the adhesives described in applications WO 2013 / 017421, WO 2013 / 017422, WO 2013 / 017423, WO2015007641 and WO2015007642. Following the adhesion of the assembly according to the invention, the supporting structure exhibits a thermal contraction measured at 185°C after 2 min sufficient, greater than or equal to 5%, which allows for easy implementation of the assembly according to the invention in a rubber article, in particular a pneumatic tire, and for obtaining the expected operation thereof. Assembly manufacturing

[0101] In a step of forming the assembly according to the invention, the first wire elements 64, 66 are assembled to form the first fabric 26 and the second wire elements 68, 70 to form the second fabric 28. The support elements, preferably coated with an adhesive composition, preferably cross-linked, 32 are also assembled with the first and second fabrics 26, 28. In the embodiment described by example, the first and second wire elements 64, 66, 68, 70 are assembled in a single step, and therefore simultaneously, with the support elements 32 to form the assembly 24. In another embodiment, each first and second fabric 26, 28 is first formed separately, and then the first and second fabrics 26, 28 are joined together with the support elements, preferably coated with an adhesive composition, preferably cross-linked, 32.The assembly formation step 24 according to the invention is implemented in a way known to those skilled in the art of woven fabrics. Impregnated assembly

[0102] Another object of the invention is an impregnated assembly, preferably for pneumatic bandage, the first fabric being impregnated at least in part with a composition called first polymeric composition, and the second fabric being impregnated at least in part with a composition called second polymeric composition.

[0103] By "impregnated," we mean that each polymer composition penetrates at least the surface of the tissue. Therefore, we can have unifacial impregnation, where one side of the tissue is covered by the polymer composition, or bifacial impregnation, where both sides of the tissue are covered by the polymer composition. In both cases, the impregnation creates mechanical anchoring through the penetration of the polymer composition into the interstices present in the tissue.

[0104] In one embodiment, each polymeric composition comprises at least one elastomer, preferably a diene elastomer. A diene elastomer (or rubber, as the two terms are synonymous) is generally understood to be an elastomer derived at least in part (i.e., a homopolymer or a copolymer) from diene monomers (monomers bearing two carbon-carbon double bonds, conjugated or not). This composition may then be in its raw or cured state.

[0105] The diene elastomer in the rubber composition is most preferably chosen from the group consisting of polybutadienes (BR), synthetic polyisoprenes (IR), natural rubber (NR), butadiene copolymers, isoprene copolymers, and mixtures of these elastomers. Such copolymers are more preferably chosen from the group consisting of butadiene-styrene copolymers (SBR), isoprene-butadiene copolymers (BIR), isoprene-styrene copolymers (SIR), isoprene-butadiene-styrene copolymers (SBIR), and mixtures of such copolymers.

[0106] Each polymer composition may contain a single diene elastomer or a mixture of several diene elastomers, the diene elastomer(s) being able to be used in association with any type of synthetic elastomer other than diene, or even with polymers other than elastomers, for example thermoplastic polymers.

[0107] Furthermore, in this embodiment, each polymer composition comprises, in addition to the elastomer, preferably diene, a reinforcing filler, for example carbon black, a crosslinking system, for example a vulcanization system and various additives.

[0108] In another embodiment, each polymer composition comprises at least one thermoplastic polymer. A thermoplastic polymer is, by definition, thermofusible. Examples of such thermoplastic polymers are aliphatic polyamides, for example nylon, polyesters, for example PET or PEN, and thermoplastic elastomers.

[0109] Thermoplastic elastomers (abbreviated "TPEs") are elastomers in the form of block copolymers based on thermoplastic blocks. With a structure intermediate between thermoplastic polymers and elastomers, they are typically composed of rigid thermoplastic sequences, notably polystyrene, linked by flexible elastomer sequences, for example polybutadiene or polyisoprene for unsaturated TPEs, or poly(ethylene / butylene) for saturated TPEs. This is why, as is known, the above TPE block copolymers are generally characterized by the presence of two glass transition peaks, the first peak (lowest temperature, generally negative) being related to the elastomer sequence of the TPE copolymer, the second peak (highest temperature, positive, typically above 80°C for preferred elastomers of the TPS type) being related to the thermoplastic part (e.g. styrene blocks) of the TPE copolymer.These TPE elastomers are often triblock elastomers with two rigid segments connected by a flexible segment. The rigid and flexible segments can be arranged linearly, in a star pattern, or branched. These TPE elastomers can also be diblock elastomers with a single rigid segment connected to a flexible segment. Typically, each of these segments or blocks contains at least 5, and usually more than 10, basic units (for example, styrene units and isoprene units for a styrene / isoprene / styrene block copolymer).

[0110] Preferably, the thermoplastic elastomer is unsaturated. By unsaturated TPE elastomer, we mean by definition and in a well-known way a TPE elastomer which is provided with ethylenic unsaturations, that is to say which has carbon-carbon double bonds (conjugated or not); conversely, a so-called saturated TPE elastomer is of course a TPE elastomer which is devoid of such double bonds.

[0111] The first and second polymer compositions may be different or identical. For example, the first polymer composition may include a diene elastomer and the second polymer composition may include a thermoplastic elastomer, or vice versa. Rubber item

[0112] The invention also relates to a rubber article comprising an assembly according to the invention, or an impregnated assembly according to the invention. The term "rubber article" includes any type of rubber article such as a balloon, a non-pneumatic object such as a non-pneumatic bandage, or a conveyor belt. Pneumatic

[0113] The invention also relates to a tire comprising an assembly according to the invention, or an impregnated assembly according to the invention.

[0114] The assembly according to the invention, impregnated or not, is particularly suitable for incorporation into a tire as described, for example, in document WO 2018 / 130782 or preferably as described in document WO 2019 / 092343.

[0115] The invention relates in particular to a tire comprising a crown having two axial ends, each extended radially inwards by a sidewall and then by a bead intended to contact a rim, the assembly consisting of the crown, the two sidewalls, and the two beadings defining an internal toroidal cavity and at least one bead, the tire comprising an assembly according to any one of the arrangements of the invention, intended to at least partially support the nominal load Z applied to the tire mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially internal part of the crown and the second fabric at least partially defining the radially internal part of the toroidal cavity, the load-bearing structure extending continuously into the internal toroidal cavity, such that, when the tire is subjected to a nominal load Z, the load-bearing wire elements,connected to a portion of the tire in contact with the ground, are subjected to buckling in compression, and at least part of the supporting wire elements, connected to the portion of the tire not in contact with the ground, are in tension.

[0116] In a particular arrangement, the toric cavity is totally delimited in its radially inner part by at least a second tissue of any arrangement of the assembly according to the invention.

[0117] In another particular arrangement, the toric cavity is partially delimited in its radially inner part by at least a second tissue of any arrangement of the assembly according to the invention.

[0118] Thus, in a preferred mode of this particular arrangement, a tire according to the invention will be a tire, in particular for passenger vehicles, having an axial width S, intended to be inflated to a nominal pressure P and to be subjected to a nominal load Z, comprising: a crown having two axial ends, each extended radially inwards by a sidewall and then by a bead intended to come into contact with a rim, the assembly consisting of the crown, the two sidewalls and the two beadeds delimiting an internal toroidal cavity, optionally a carcass reinforcement, connecting the two sidewalls together by extending into a radially internal portion of the crown and being anchored, in each bead, to a circumferential reinforcing element, at least one bead being extended axially inwards by a cantilevered flexible tread comprising a free end, the flexible tread comprising a portion anchored to the bead and a rigid running portion, extending axially inwards from the anchoring portion to the free end, the tire comprising an assembly according to the invention,intended to bear at least part of the nominal load Z applied to the tire mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially inner part of the crown and the second fabric being fixed to the flexible tread, the load-bearing structure extending continuously into the inner toroidal cavity, such that, when the tire is subjected to a nominal load Z, the load-bearing wire elements, connected to a portion of the tire in contact with the ground, are subjected to buckling in compression and at least part of the load-bearing wire elements, connected to the portion of the tire not in contact with the ground, are in tension. Measurement methods

[0119] Elongation at maximum force is measured in accordance with standard NF EN ISO 13934-1 of July 2013. Since this elongation at maximum force is measured along the first general direction, it corresponds to the elongation of the first fabric at which at least one wire element breaks. Other wire elements break within the portion of the elongation between the elongation at maximum force and the elongation at break, as defined in standard NF EN ISO 13934-1 of July 2013. This measurement can be performed on an unpainted assembly, a bonded assembly, or one extracted from a tire. Preferably, the measurement will be performed on an unpainted or bonded assembly.

[0120] In this application, the properties of the first fabric are determined by subjecting the first fabric to a tensile test in accordance with the NF EN ISO 13934-1 standard of July 2013. The intrinsic properties of the wire elements are determined by subjecting the wire elements to a tensile test in accordance with the ASTM D885 / D885 MA standard of January 2010. Description of the figures

[0121] The invention is illustrated by the figures 1 to 4 , not shown to scale and described below: [ Fig 1 Meridional cross-section of a tire according to the invention, with two symmetrical flexible soles, each comprising a flexible anchoring portion. Fig 2 Circumferential cross-section of a tire according to the invention, in its crushed state. Fig 3 ] Top view of the assembly according to the invention before its assembly in the tire. Fig 4] Cross-sectional view of the assembly according to the invention along the section plane PP' shown on the Fig.3 illustrating the load-bearing wire elements in a folded state.

[0122] There figure 1represents the meridian section of a tire 1 according to the invention, with two symmetrical flexible soles 8 each comprising a flexible anchoring portion 81. The tire 1 comprises a crown 2 having two axial ends 21, each extended radially inwards by a sidewall 3 and then by a bead 4 intended to come into contact with a rim 5, the whole delimiting an internal toroidal cavity 6. It further comprises a carcass reinforcement 7, connecting the two sidewalls 3 to each other by extending into a radially internal portion of the crown 2 and anchored, in each bead 4, to a circumferential reinforcing element 41. Each bead 4 is extended axially inwards by a cantilevered flexible tread 8 comprising a free end I. The flexible treads 8 extending each bead 4 are symmetrical, with respect to an equatorial plane XZ equidistant from the axial ends 21 of the crown 2, and structurally identical.Each flexible sole 8 comprises an anchoring portion 81 to the bead and a rigid running portion 82, extending axially inwards from the anchoring portion 81 to the free end I. In the case shown, the anchoring portion 81, made up of a reinforcement extension of the carcass 7, has a stiffness K2 lower than the stiffness K1 of the rigid running portion 82. The anchoring portion 81 of the flexible sole 8 has an axial width W3, measured between point J, the outermost axial point of the flexible sole 8 and in contact with the bead 4, and the outermost axial end K of the running portion 82 of the flexible sole 8. Each flexible sole 8 has an axial width W1, measured between point J, the outermost axial point of the flexible sole 8 and in contact with the bead 4, and the innermost axial free end I of the flexible sole 8. The running portion 82 of the flexible sole 8 has an average radial thickness T.The tire 1 further comprises a load-bearing structure 9, intended to bear at least part of the nominal load Z applied to the tire mounted on its rim 5 and inflated to its nominal pressure P, comprising load-bearing wire elements whose load-bearing wire portions 91, two by two independent, extend continuously in the inner toroidal cavity 6 between a first fabric 221, of a radial width W2, attached to an interface 22 radially inside the top and a second fabric 912 connected to the flexible sole 8, such that, when the tire is subjected to a nominal radial load Z, the load-bearing wire portions 91, connected to a portion of the tire in contact with the ground, are subjected to buckling in compression and at least part of the load-bearing wire portions 91, connected to the portion of the tire not in contact with the ground, are in tension.The identical 91 wire-bearing portions form, with a radial direction ZZ', an angle C of at most equal to 50°.

[0123] There figure 2This figure presents a circumferential cross-section of a tire 1 according to the invention, mounted on a rim 5, in its inflated and compressed state, i.e., subjected to a nominal pressure P and a nominal radial load Z. The load-bearing structure 9 comprises load-bearing elements whose independent, two-by-two load-bearing wire portions 91 extend continuously within the inner toroidal cavity 6, from a first fabric attached to a radially inner interface (not shown) of the apex 2 to a second fabric attached to the radially outer interface of the flexible tread (not shown). The tire 1, subjected to a nominal radial load Z, is in contact with a flat surface via a contact area A, having a circumferential length XA.The load-bearing wire portions 91, connected to a portion of the tire in contact with the ground, are subject to buckling in compression and at least part of the load-bearing wire portions 91, connected to the portion of the tire not in contact with the ground, are in tension.

[0124] We represent on the figures 3 And 4 respectively a top view of an arrangement of an assembly 24 according to the invention and a cross-section of an arrangement of the assembly along a plane PP' as shown on the figure 3 .

[0125] The first fabric 26 comprises two longitudinal edges 26A and 26B. The first fabric 26 extends along a first general direction G1 substantially parallel to each longitudinal edge 26A, 26B. The first fabric 26 comprises first yarn elements 64, called first warp yarn elements, and first yarn elements 66, called first weft yarn elements. The first warp yarn elements 64 of the first fabric 26 are substantially parallel to each other and extend along a first direction called the warp direction C1, substantially parallel to the first general direction G1. The first weft yarn elements 66 of the first fabric 26 are substantially parallel to each other and extend along a first direction called the weft direction T1 and interlace with the first warp yarn elements 64. The first warp yarn elements 64 extend continuously along the entire length of the first fabric 26.

[0126] Similar to the first fabric 26, the second fabric 28 comprises two longitudinal edges 28A and 28B. The second fabric 28 extends along a second general direction G2 substantially parallel to each longitudinal edge 28A, 28B. In this case, the second general direction G2 is substantially parallel to the first general direction G1. The second fabric 28 comprises second yarn elements 68, called second warp yarn elements, and second yarn elements 70, called second weft yarn elements. The second warp yarn elements 68 of the second fabric 28 are substantially parallel to each other and extend along a second direction called the warp direction C2, substantially parallel to the second general direction G2.The second weft wire elements 70 of the second fabric 28 are substantially parallel to each other and extend along a second direction called weft T2 and interweave with the second warp wire elements 68. The second warp wire elements 68 extend continuously over the entire length of the first fabric 28.

[0127] Within each first and second fabric 26, 28, the warp and weft directions form an angle with each other ranging from 70° to 90°. In this case, the angle is approximately equal to 90°.

[0128] Within the tire 1, each first and second chain direction forms an angle less than or equal to 10° with the circumferential direction XX' of the tire 1. In the first embodiment, each first and second chain direction forms a substantially zero angle with the circumferential direction XX' of the tire 1.

[0129] Each wire element 64, 66, 68, 70 is a textile wire element.

[0130] The wire elements 64 are all substantially identical. Each first wire element 64 of the chain comprises first and second wire elements 65, 67. The second wire element 67 is substantially straight, and the first wire element 65 is wound substantially helically around the second wire element 67, forming loops in a substantially periodic manner (not shown). Here, the first wire element 65 is a multifilament PET strand with a count of 110 tex, and the second wire element 67 is an assembly of two multifilament strands, each with a count of 11.5 tex.

[0131] The wire elements 66, 68, 70 are all substantially identical, here made of polyethylene terephthalate (PET). In this case, each wire element 66, 68, 70 is a spun wire element having a linear density of 170 tex and a tenacity of 66 cN / tex.

[0132] The assembly 24 includes a supporting structure 30 comprising supporting wire elements 32. Each supporting wire element 32 extends alternately from the first fabric 26 to the second fabric 28 and from the second fabric 28 to the first fabric 26 when moving along the supporting wire element 32. Each supporting wire element 32 is a textile supporting wire element, here made of Nylon 6-6 and preferably coated with a cross-linked RFL adhesive.

[0133] Each supporting wire element 32 comprises a supporting wire portion 74 extending between the first and second tissues 26, 28, in particular between the inner faces 42 and 46. Each supporting wire element 32 comprises first and second anchoring wire portions 76, 78 of the supporting wire element 32 in the first tissue 26 and the second tissue 28, respectively. Each first and second anchoring wire portion 76, 78 extends the supporting portion 74 in each first tissue 26 and second tissue 28, respectively. Each first and second anchoring wire portion 76, 78 is interwoven with each first tissue 26 and second tissue 28, respectively. Each first and second anchoring wire portion 76, 78 is wound at least partially around at least one first wire element 64, 66 of the first tissue 26 and at least one second wire element 68, 70 of the second tissue 28, respectively.Thus, each anchor wire portion 76, 78 connects two carrier wire portions 74 to each other and each carrier wire portion 74 connects two anchor wire portions 76, 78 to each other.

[0134] In this case, each first anchoring wire portion 76 is wound at least partially around at least one first weft wire element 66 of the first fabric 26 and here, preferably, around at least two adjacent first weft wire elements 66 along the first general direction G1. Similarly, each second anchoring wire portion 78 is wound at least partially around at least one second weft wire element 68 of the second fabric 28, preferably around at least two adjacent second weft wire elements 66 along the second general direction G2.

[0135] Each first and second anchor wire portion 76, 78 extends in a direction substantially parallel to respectively the first and second general direction G1, G2.

[0136] Each first anchor wire segment 76 passes alternately from face 41 to face 42 between two adjacent first frame wire elements 66, around which the first anchor wire segment 76 is wound. Similarly, each second anchor wire segment 78 passes alternately from face 46 to face 49 between two adjacent second frame wire elements 68, around which the second anchor wire segment 78 is wound.

[0137] The first tissue 26 comprises transverse straight zones Z1 of a first group of zones, each transverse straight zone Z1 having a rest length Ld1 along the first general direction G1 and extending over the entire width of the first tissue 26. This length Ld1 is the same for all transverse straight zones Z1, here equal to 7.9 mm. All the transverse straight zones Z1 of the first group of transverse straight zones are identical.

[0138] The first tissue 26 also includes transverse straight zones Z2 from a second group of zones, each transverse straight zone Z2 having a rest length Ld2 along the first general direction G1 and extending over the entire width of the first tissue 26. This length Ld2 is the same for all transverse straight zones Z2 and is here equal to 5.8 mm. All the transverse straight zones Z2 of the second group of transverse straight zones are identical.

[0139] Each straight transverse zone Z1 of the first group of zones alternates, according to the first general direction or according to the circumferential direction XX', with a straight transverse zone Z2 of the second group of zones.

[0140] When the first tissue is at rest, as shown on the figure 4 , The sum of the rest lengths Ld1 and Ld2 of all the transverse straight zones along the first general direction G1 is approximately equal to L. In this case, for a length L of the assembly 24, and therefore a length L of the first fabric L = 1692 mm with a width l = 220 mm, the sum SLd1 of the rest lengths Ld1 of the transverse straight zones Z1 is equal to 975 mm and the sum of the rest lengths Ld2 of the transverse straight zones Z2 is equal to 717 mm. The first fabric thus comprises 123 complete transverse straight zones Z1 and Z2, as well as one incomplete transverse straight zone Z2.

[0141] In the particular arrangement illustrated figure 4 , corresponding to a particular arrangement of an impregnated assembly 21 according to the invention, the first fabric 26 is impregnated at least in part with a first layer 33 of a first polymeric composition 34. The second fabric 28 is impregnated at least in part with a second layer 35 of a second polymeric composition 36. Examples

[0142] We compare the thermal contractions of the load-bearing structures of different assemblies whose structure is similar to that presented figure 4 .

[0143] A first assembly corresponds to the assembly described in document WO 2018 / 130783.

[0144] The first assembly conforming to the teaching of document WO 2018 / 130783 comprises a first fabric consisting of first warp yarn elements, each comprising a first yarn element made of a multifilament strand of PET with a count of 110 tex and a second yarn element made of an assembly of two multifilament strands of rayon, each with a count of 11.5 tex. The first yarn element is wound helically around the second yarn element, forming a wrap around the second yarn element. Each first yarn element is therefore, according to the terminology of those skilled in the art, a wrapped yarn. The first fabric also comprises first weft yarn elements made of a multifilament strand of PET with a count of 170 tex.This assembly also includes a second fabric comprising second warp yarn elements and second weft yarn elements, each of these elements being made of a multifilament PET strand with a count of 170 tex, as well as a load-bearing structure made of PET yarn elements with a count of 55 tex.

[0145] A second assembly according to the invention comprises a first fabric including first warp yarn elements, each comprising a first yarn element made of a multifilament strand of PET with a count of 110 tex and a second yarn element made of an assembly of two multifilament strands of rayon, each with a count of 11.5 tex. The first yarn element is wound helically around the second yarn element, forming a wrap around the second yarn element. Each first yarn element is therefore, in the terminology of those skilled in the art, a wrapped yarn. The first fabric also includes first weft yarn elements made of a multifilament strand of PET with a count of 170 tex.This assembly also includes a second fabric comprising second warp yarn elements and second weft yarn elements, each of these elements being made of a multifilament PET strand having a count of 170 tex, as well as a load-bearing structure made of Nylon 6.6 yarn elements having a count of 47 tex coated with a cross-linked adhesive composition of RFL glue, these load-bearing yarn elements having a thermal contraction measured at 185°C after 2 min of 9%. The yarn elements of the load-bearing structure were coated prior to their incorporation into the assembly according to the invention, by an adhesion treatment comprising: . a) a step, called adhesion, of bringing the load-bearing filament element into contact with an adhesive composition of the RFL type glue, consisting of an aqueous composition (approximately 81% by weight of water) based on resorcinol (approximately 2%), formaldehyde (approximately 1%) and a rubber latex (approximately 16% of NR, SBR and VP-SBR rubbers), and b) a heat treatment step, called adhesion drying, at a temperature of 190°C for a duration of 2 min, the supporting wire elements of the supporting structure being held under a tension of 0.4 daN during the adhesion treatment.

[0146] The two assemblies are then subjected to the same gluing process, designed to enable their incorporation into a rubber article. To achieve this, each assembly is coated with a layer of adhesion primer and a layer of adhesive compound. This is done by immersing each assembly in an initial aqueous bath (approximately 94% water) based on epoxy resin (polyglycerol polyglycidyl ether, approximately 1%) and an isocyanate compound (caprolactam block, approximately 5%). The adhesion primer is then coated with the adhesive compound, in this case an RFL adhesive (approximately 81% water by weight) based on resorcinol (approximately 2%), formaldehyde (approximately 1%), and a rubber latex (approximately 16% NR, SBR, and VP-SBR rubbers). Then, the primer and adhesion composition layers are dried, for example in a drying oven at 140 °C for 30 s.Then, the assemblies are heat-treated to crosslink the primer and adhesion composition layers by passing the coated assemblies through a treatment oven at 240 °C for 30 s.

[0147] The thermal contraction of the load-bearing wire elements of each assembly is measured after these operations. The load-bearing elements of the first assembly exhibit a thermal contraction of 0.1%, measured at 185°C after 2 minutes, while the load-bearing elements of the second assembly exhibit a thermal contraction of 5%, also measured at 185°C after 2 minutes. The implementation of the assembly according to the invention in a rubber article, particularly a pneumatic tire, is therefore greatly facilitated because small discrepancies during its incorporation can be compensated for during the curing (or cross-linking) phase of the rubber article or pneumatic tire. Furthermore, due to the homogeneous tension of the load-bearing wire elements obtained after curing the rubber article or pneumatic tire, the expected performance of the assembly according to the invention will be achieved.

Claims

1. Assembly comprising: a. a first fabric, having a longitudinal edge extending in a first direction (G1); b. a second fabric, comprising a longitudinal edge extending in a second direction (G2), the first direction (G1) and the second direction (G2) being substantially parallel; c. a load-bearing structure comprising load-bearing filamentary elements made of heat-shrinkable textile material connecting the first fabric to the second fabric, each load-bearing filamentary element comprising at least one load-bearing filamentary portion extending between the first and the second fabric; characterized in that the load-bearing filamentary elements exhibit a thermal contraction CT, measured after 2 min at 185°C, greater than or equal to 5%.

2. Assembly according to the preceding claim, wherein each load-bearing filamentary element exhibits a thermal contraction CT, measured after 2 min at 185°C, strictly greater than 5%, preferably greater than or equal to 6%, preferably greater than or equal to 8%.

3. Assembly according to any one of the preceding claims, wherein the load-bearing filamentary elements are made of a polyamide material, preferably selected from aliphatic polyamides, preferably from polyamides 4-6, 6, 6-6, 11, 12, and very preferably nylon 6-6.

4. Assembly according to any one of the preceding claims, wherein the load-bearing filamentary elements comprise at least one multifilament strand comprising several monofilaments.

5. Assembly according to any one of Claims 1 to 3, wherein the load-bearing filamentary elements consist of a single monofilament.

6. Assembly according to any one of the preceding claims, wherein each load-bearing filamentary element has a count in the range from 8 Tex to 210 Tex, preferably from 23 Tex to 140 Tex, and more preferably from 45 Tex to 70 Tex.

7. Assembly according to any one of the preceding claims, wherein each load-bearing filamentary element is coated with an adhesive composition.

8. Assembly according to Claim 7, wherein, prior to being incorporated into the assembly, each load-bearing filamentary element of the load-bearing structure is subjected to a bonding treatment comprising at least: a. a so-called adhesive-coating step of bringing the load-bearing filamentary element into contact with an adhesive composition, and b. a so-called adhesive-drying heat treatment step at a temperature ranging from 100 to 230°C, preferably from 160 to 230°C for a period ranging from 30 to 300 s, the load-bearing filamentary element being maintained under a tension of between 0.2 and 4.0 daN, preferably of between 0.2 and 3 daN, and more preferably of between 0.2 and 1 daN during the bonding treatment.

9. Assembly according to any one of the preceding claims, wherein the first fabric comprises first filamentary elements, called warp elements, substantially parallel to each other and extending in a first direction (C1) called warp direction, substantially parallel to the first general direction (G1), and wherein, for any elongation of the first fabric in the first general direction (G1) less than or equal to 2×π×H / L, there are first warp filamentary elements that are unbroken, with 0 < H ≤ K×H0, H0 representing in metres the mean straight-line distance between an internal face of the first fabric and an internal face of the second fabric when each load-bearing filamentary portion is at rest, L representing in metres the length at rest of the first fabric in the first general direction (G1) and K=1.3.

10. Impregnated assembly comprising an assembly according to any one of the preceding claims, the first fabric being impregnated at least in part with a composition referred to as the first polymeric composition, and the second fabric being impregnated at least in part with a composition referred to as the second polymeric composition.

11. Rubber article comprising an assembly according to any one of Claims 1 to 9, or an impregnated assembly according to Claim 10.

12. Tyre comprising an assembly according to any one of Claims 1 to 9, or an impregnated assembly according to Claim 10.

13. Tyre according to the preceding claim comprising a crown having two axial ends each extended, radially inwards, by a sidewall then by a bead intended to come into contact with a rim, the assembly consisting of the crown, the two sidewalls and the two beads delimiting a toric interior cavity and at least one bead, the tyre comprising an assembly according to any one of the arrangements of the invention, intended to react at least part of the nominal load Z applied to the tyre mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially inner part of the crown and the second fabric at least partially delimiting the radially inner part of the toric cavity, the load-bearing structure extending continuously in the toric interior cavity, so that, when the tyre is subjected to a nominal load Z, the load-bearing filamentary elements, connected to a portion of tyre in contact with the ground, are subjected to buckling in compression and at least a part of the load-bearing filamentary elements, connected to the portion of tyre not in contact with the ground, are in tension.

14. Tyre according to Claim 13, wherein the toric cavity is partially delimited in its radially inner part by at least one second fabric of an assembly according to any one of Claims 1 to 9.

15. Tyre according to the preceding claim comprising: a. a crown having two axial ends each extended, radially inwards, by a sidewall then by a bead intended to come into contact with a rim, the assembly consisting of the crown, the two sidewalls and the two beads delimiting a toric interior cavity, b. at least one bead being extended axially inwards by a cantilevered flexible base comprising a free end, c. the flexible base comprising an anchoring portion for anchoring to the bead and a rigid main-span portion, extending axially inwards from the anchoring portion to the free end, the tyre comprising an assembly according to one of Claims 1 to 9 or an impregnated assembly according to Claim 10, intended to react at least part of the nominal load Z applied to the tyre mounted on its rim and inflated to its nominal pressure P, the first fabric being fixed to the radially inner part of the crown and the second fabric being fixed to the flexible base, the load-bearing structure extending continuously into the toric interior cavity, such that, when the tyre is subjected to a nominal load Z, the load-bearing filamentary elements, connected to a portion of tyre in contact with the ground, are subjected to buckling in compression and at least a part of the load-bearing filamentary elements, connected to the portion of tyre not in contact with the ground, are in tension.